高墩刚构桥基础不均匀沉降对无缝线路的影响研究  

The Effect on Continuous Welded Rail Caused by Uneven Foundation Settlement of High-pier Rigid frame Bridge

作　　者：马旭峰[1] 胡志鹏[1] 谢铠泽[1] 王平[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《铁道标准设计》2014年第8期48-52,共5页Railway Standard Design

基　　金：中央高校基本科研业务费专项资金资助项目(编号:2682013CX043)

摘　　要：高墩大跨刚构桥桥墩若出现工后沉降,桥墩纵向和横向的沉降值存在差异,将导致桥墩出现纵横向偏转。针对桥墩偏转对无缝线路的影响,结合某一高墩大跨刚构桥上无缝线路,利用有限元方法,建立空间线—桥—墩—体化模型,分析桥墩纵向、横向偏转对桥上无缝线路的影响。计算结果表明:随着桥墩纵向偏转角度的增加,钢轨中产生的附加力近似呈线性增加;当桥墩纵向偏转与温度荷载耦合时,桥墩纵向偏转所引起的钢轨纵向力变化幅度不大。桥墩的横向偏转主要引起轨道长波不平顺,钢轨位移及不平顺随着桥墩的横向偏转角的增加而增加,并且当桥墩横向偏转角较大时,整个桥上无缝线路会出现多处不平顺超限,超限位置主要分布在左、右侧桥台及两个梁体接缝处。If post-acceptance settlement occurs at the pier of a long-span high-pier rigid frame bridge, there will be settlement difference between longitudinal and lateral directions of the pier, and the settlement difference will cause a longitudinal or lateral deflection of the pier. Focusing on the problem of bridge pier deflection, and taking a certain continuous welded rail on a large-span high-pier rigid frame bridge as an example, this study established a spatial integrated model of track-bridge-pier by using finite element method, and analyzed the effect on the continuous welded rail caused by the longitudinal and lateral deflections of bridge pier. The results show that：（ a） As the longitudinal deflection angle of bridge pier increases, the additional force of the rail will approximately linearly increase; when coupling the longitudinal deflection of bridge pier with the temperature load, the rail＇s longitudinal force caused by the longitudinal deflection of bridge pier will change marginally. （ b） The lateral deflection of bridge pier mainly causes the irregularity of rail＇s long wave;the deformation and irregularity of rail will increase with the increase of the lateral deflection angle of bridge pier;when the lateral deflection angle of bridge pier is relatively large, there will be a lot of over-limit irregularities along the whole continuous welded rail on the bridge, and the over-limit irregularities will mainly occur at the left and right bridge abutments as well as at the juncture between two girders of the bridge.

关 键 词：铁路桥 刚构桥 偏转 无缝线路 稳定性 

分 类 号：U443.2[建筑科学—桥梁与隧道工程] U213.9[交通运输工程—道路与铁道工程]